Pulling device



April 11, I950 M, E, TOWER 2,503,426

' PULLING DEVICE Filed April 15, 1946 2 Sheet s-Shet 1 (Ittomeg M. E. TOWER PULLING DEVICE April 11, 1950 2 Sheets-Sheet 2 Filed April 15, 1946 INVENTOR. M/ZZS 5 T0 WER BY Patented Apr. 11 1950 UNITED STATES PATENT OFFHIE PULLING. DEVICE Miles E. Tower, Boise,.Idaho.

Application April 15, 1946, Serial No. 662,254

q 2'Clailns. 1

This invention relates to a slidehammeripuller for bearing cups, valves; oil seals. bearings; pulleys, axles and'the like; and, more particularly, is the provision of mechanism for insideandoutsidepulling operations, readily adaptable to either type of work. i g

This application is a continuation in part of my application, Serial number 518,683, filed'January 18, 1944, and now abandoned.

It is an important object of the invention to provide a pulling mechanism in which either internal or external pulling jobs may be accomplished with the same combination of elements with resorting to the additional or removal of attachments to meet the two types of work.

It is another object of the invention to provide, in a puller of the type mentioned, inside and outside camming elements which may selectively be used without hindrance of the use of one by the presence of the other.

A further object of the" invention relates to providing a slide puller mechanism of the multiple leg type with camming'elements operable upon the legs to exert force in opposite directions for the purpose of locking the legs to an object to be pulled.

Preferably the legs are disposed in diametrically opposite positions with respect to said body. For the purpose of spreading the legs apart the camming surfaces are on the outer faces of the body. Conversely, for the purpose of drawing the legs together the camming surfaces are on outstanding hook arms with the camming surfaces on the inside of the hook. Aislide hammer ismounted for movement along the other portion of the shaft which has a shoulder tobe struck by the hammer. Means is also provided on the shaft for manually turning the same to produce longitudinal movement ofthe cammed' body. Such being the case, the puller may be adapted to externally engage an obj'ectto bepulled by drawing the legs and the. internalj'aws towarweach other so that the latter may engage under a flange or the like on the object. Alternatively, by selecting the other camming surfaces on the face of the body and causing those surfaces and the body to be interposed between the legs the latter can be spread apart and jaws on the outer faces of the legs can be engaged under a flange or other body locatedin'side a casing, a hub or the like.

The foregoing obj ectsia'ndother ancillary thereto, I prefer to accomplishes follows:

According to apreferredembodiment of my invention]: provide across head in which is journaled a guide shaft intermediate its endsfor rotation but without axial movement. In a preferable form ofmy-invention, one of the end portions of the rotatable shaft carries a cam body I which moves longitudinal of the shaft and includes exterior camming surfaces. I have found it most expedient to form this body as a nut which has internal threads-mating with external threads on that portion. of the shaft on which the body is mounted. Pivotally mounted on the cross-head is a pair of legs each having a jaw, either externally or internally directed or a com-v bination of both types of jaws. Each of the pivoted legs liesalongside the body having the camming surfaces and are to be actuated upon movement of said body.

The novel features that I consider characteristic of my invention are set forth with particularity in the appended claims. The invention itself, however, both as to its organization and its method of operation, together with additional objects and advantages thereof, will be understood from the following description of a specific embodiment when read in connection with. the accompanying drawings in which:

Figure 1 is a view in elevation of my invention as shown for an internal pulling operation;

Figure 2 is a fragmentary view similar to Figure 1 showing the mechanism asxarranged for an external pulling operation;

Figure 3 is a sectional View taken on line 3, 3 of Figure 1;

Figure 4 is a cross-section taken on line 4, 4 of Figure 2;

Figure 5 is a view partly in side elevation and partly in section of a slightly modified mechanism for an internal pulling operation;

Figure 6 is a sectional view taken on the line $t of Figure 5; and

Figure 7 is a sectional view taken on the line 'i---? of Figure 5.

A slide hammer puller must have two totally distinct characteristics.

It must be capable of securely engaging the member to be pulled; and it is preferable that it be adaptable Without the addition or removal of attachments to pull either externally or internally upon either type of object. Accordingly, a preferred embodiment of my invention, referring to the figures in the drawings, is constituted by a cross-head which swingably supports a pair of jaw legs and also journals a shaft that carries a cam member and a hammer member. The cross-head I9 is bored at H to receive the shaft i2; The shaft 12 has a shoulder at I5 intermediate its ends and has a reduced portion I3 extending from the shoulder I5 to one end of the shaft. The reduced portion I3 extends through the bore II and is journalled therein. The two nuts I4 hold the cross-head I9 against the shoulder I5. A cam member designated as a whole by the numeral I6 is also threadedly engaged on shaft portion I3. The body of member I6 has cam surfaces I8 on opposite faces thereof and outstanding on each side of the body are hook arms I9 which have inwardly directed cam surfaces 20. A pair of legs 22 and 23 are swingably mounted on pins 24 carried by the cross-head I and lie alongside of shaft portion I3 for engagement with either the external or internal camming surfaces I8 and 20 respectively. Each of the legs 22 or 23 has an outside jaw or horn 25 and an inside jaw or horn 26.

That portion of the shaft I2 to the opposite side of the cross-head from portion I3 and here designated by the numeral 39 has a striker head 3I secured on its outer end to provide the shoulder 32, which is struck by the slide hammer 33 when that member, which is slideably mounted on shaft portion 30, is moved theretoward. The shaft I2 may be manually rotated by the radial arms 34 which here are shown as a pin inserted in a passage 35 in the head 3 I.

Considering Figure I specificall the object 31 to be pulled has an internal flange or other similar projection 38 which is engaged by the external jaws 25 on the swingable legs of my puller. The jaws 25 are engaged firmly and securely under such protuberances 38 by causing the cam member I6 to move toward the cross head In whereby a greater portion of the cam is disposed between each leg and the shaft portion I3. When the legs and jaws are firmly seated in this manner the hammer 33 is forcefully struck against the shoulder 32 to impart a withdrawing force to the object 31.

In similar manner as shown in Figure 4 an object having external elements 4| which may make the form of an annular flange are engaged b the internal jaws 26 and such a member would be pulled when the hammer is struck against a shoulder '32. In this latter instance rotation of shaft I2 is directly opposite that described in Figure 1 and the movement of the cam member I6 is toward the end of shaft portion I3 and away from i the cross head l9, whereby the cam surfaces 20 of the hook arms I9 press on the outer faces of the engaged legs 22 and 23.

In the embodiment of the invention shown in Figures 5, 6, and '7 there are certain refinements which I have found to be particularly advantageous in the practical use of the tool. The general construction is essentially the same as in the forms previously described. There is a shaft 42 having a head or stop 43 threaded on one end to provide a stop for a sliding hammer 44. The stop 43 has a removable bar 45 therein for turning the shaft and for pulling. The bar is releasably held in place by a ball 46, a spring 41 and a screw plug 48. The plug 48 is threaded into the end of the stop 43. There is a shoulder 49 on the shaft 42 near the end thereof opposite the stop 43. The shaft has a portion 59 reduced in diameter and threaded beyond the shoulder. This portion of the shaft receives a cross-head which is retatable on the portion 50. A nut '52 and a lock nut 53 are provided on the shaft portion 50 to prevent endwise movement of the cross-head away from the shoulder 49.

. The cross-head 5I pivotally mounts two grapple legs 54 and 55 by means of pivot pins 56 and 51. Cotter pins 58 may be used to secure the pins 56 and 51 in position. A conoidal jaw expander body 59 is threaded on the shaft portion 59. The legs 56 and 55 are provided with hollow ground or concave inner faces 60 and BI, respectively, to engage the curved outer surface of the bod 59. The hollow ground faces need to extend throughout most of the length of the legs 54 and 55 and particularly to their free ends since the body 59 must be close to this free end for most effective internal pulling operation. The user of the tool may have different sizes of the jaw expanders with .curved surfaces to accommodate the tool to large or small ranges of openings if desired.

It will be observed that the legs 54 and 55 are extended slightly above the cross head so that the hammer engages them first when it is moved toward the cross head. This enables the user to employ the hammer to give light seating blows to the jaws where they have to cut into an accumulation of dirt, rust, etc., to obtain a good grip behind a bearing or other internal object being removed.

In all the forms of the invention my improved puller has the advantage that the cross-head is held against longitudinal movement on the shaft, and the jaws are moved by the expander body that is threaded on the shaft. The construction is such that the expander and the jaws take the strain and the expander is close to the gripper aws.

While I have shown and described particular embodiments of my invention, it will occur to those skilled in the art that various changes and modifications may be made without departing from the invention, and I, therefore, aim in the appended claims to cover all such changes and modifications as fall within the true spirit and scope of my invention.

Having thus described my invention, I claim:

1. A pulling device comprising a shaft, a crosshead rotatably mounted on said shaft intermediate its ends, means retaining said cross-head against longitudinal movement with respect to said shaft, a body movable on one end portion of said shaft, screw threads on said body and said shaft whereby said body is longitudinally movable relative said cross-head upon rotation of the shaft, a pair of legs swingably mounted on said cross-head and disposed each on an opposite side of said body said body being engageable with the legs whereb to move the legs outward as the body is adjusted toward the cross-head, means to prevent relative rotation of said body and said crosshead during turning of said shaft, said bod having hooks outstanding therefrom to engage the outer faces of said legs, camming portions on said hooks and said legs to swing the legs toward said shaft upon movement of said body toward said end of the shaft, and jaws on the inner faces of said legs to externally engage a body to be pulled.

2. A pulling device comprising a shaft, a crosshead rotatably mounted on said shaft intermediate its ends, means retaining said cross-head against longitudinal movement with respect to said shaft, a body movable on one end portion of said shaft, screw threads on said body and said shaft whereby said body is longitudinally movable relative said cross-head upon rotation of the shaft, a pair of legs swingably mounted on said cross-head and disposed each on an opposite side of said body, means to prevent relative rotation of said body and said cross-head during turning of said shaft, said body having. hooks outstanding therefrom to engage the outer faces of said legs, camming means between said hooks and said legs to swing the legs relative said shaft upon movement of said body toward said end of the shaft, camming surfaces on said body for engaging the inner faces of said legs to swing them outwardly from the shaft when the body is moved away from said end, and jaws on the ends Of said legs.

MILES E. TOWER.

REFERENCES CITED The following references are of record in the file of this patent:

Number 6 UNITED STATES PATENTS Name Date Winchell Oct. 9, 1923 Iverson Nov. 18, 1924 McCord Mar. 27, 1927 Helms June 12, 1928 Corkum June 12, 1928 Keefer Oct. 13, 1931 Johnson et a1 Jan. 3, 1933 Pepperdine Aug. 22, 1939 

